KR0128103B1 - Pile cap structure and connecting structure for pile cap and base plate - Google Patents

Abstract

When the support plate(200,300) is completed to be fabricated on the pile shoe(6), the tension tool(500) is provided on the one support plate(300) and the PC steel rod(91) is increased by this tension tool. As the PC steel rod is increased with the tension tool, its passage is as follows : Tension shaft(502), tension plate(503), binding band(505), support plate(300), penetrating body of combining member(B), fastening body of combining member, pile shoe(6) and PC steel rod(91)

Description

Pile shoe and combination structure of pile shoe and support plate

1 is a perspective view of a conventional pile shoe.

FIG. 2 is an enlarged view of a part of FIG.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view taken along the line B-B in FIG.

5 is a cross-sectional view taken along the line C-C of FIG.

6 is another embodiment of a conventional pile shoe.

FIG. 7 is an enlarged view of part “I” of FIG.

8 is a cross-sectional view taken along the line D-D of FIG.

9 is a sectional view taken along the line E-E of FIG.

10 is a cross-sectional view taken along the line F-F of FIG.

11 is a manufacturing process diagram of a conventional pile shoe.

12 is another embodiment of the manufacturing process diagram of the conventional pile shoe.

13 is a perspective view of a reinforcing bar for making a pile.

14 is a perspective view of a state in which a reinforcing bar mounted on a pile shoe is stored in a lower mold.

FIG. 15 is a perspective view illustrating a method of mounting a PC steel rod to a pile shoe. FIG.

FIG. 16 is an enlarged view of the portion of FIG.

FIG. 17 is a cross-sectional view taken along line G-G of FIG.

18 is a perspective view showing a method of mounting a PC steel rod to the pile shoe.

19 is an enlarged view of the "d" part of FIG.

FIG. 20 is a sectional view taken along the line H-H in FIG. 19. FIG.

21 is on the stakes Process diagram for assembling the plate.

22 is Process diagram for joining band of tensioning device to plate.

23 is a plan view of the tension bolt is mounted on the pile shoe.

24 is a cross-sectional view taken along the line K-K in FIG.

25 is a state in which the tension device is mounted on the pile shoe.

Fig. 26 is a conceptual diagram showing the direction of action of the tensile force acting on the PC steel rod and the tension bolt when tensioning with the tensioning device.

27 is a perspective view of a pile shoe according to the present invention.

FIG. 28 is an enlarged view of the section "e" of FIG.

FIG. 29 is a cross-sectional view taken along line L-L in FIG. 28. FIG.

30 is a cross-sectional view taken along the line M-M of FIG.

FIG. 31 is a sectional view taken along the line N-N in FIG. 28;

32 is another embodiment of the pile shoe according to the present invention.

33 is an enlarged view of the portion “bar” of FIG.

34 is a cross-sectional view taken along the line O-O of FIG.

35 is a sectional view taken along the line P-P of FIG.

36 is a cross-sectional view taken along line Q-Q of FIG.

37 is a manufacturing process of the pile shoe according to the present invention.

38 is a manufacturing process diagram of another pile shoe according to the present invention.

Figure 39 is a partial view of the PC steel rod and the pile shoe mounted on the pile shoe according to the present invention.

40 is a cross-sectional view taken along the line R-R of FIG. 39;

* Explanation of symbols on the main parts of the drawings

1, 6: pile shoe 11, 66: pile shoe plate

13, 67: steel rod mounting portion 14: tension bolt connection portion

15, 69: communication path 68: coupling part mounting part

The present invention is a pile shoe and the pile shoe to be mounted to the tip or head of the pile or the connection between the pile and the pile used in the foundation work for distributing or transmitting the load of the structure to the support ground in civil engineering or building construction It relates to a combination structure to engage the tension support plate.

Piles are used to improve inadequate ground conditions by distributing loads throughout the ground or by transferring it to deeper layers when the ground is not strong and the base plate cannot be supported directly on a solid bed. Types include PC piles (steel piles) and PC piles (pretensioned spun concrete piles) and PHC piles made to give resistance to pile bending by giving prestress to concrete. Pretensioned spun high strength concerte piles (hereinafter referred to as "PC piles"). And when making piles used for ground foundation work, by putting a pile shoe at the end of the pile head and piles, the pile pile machine such as hammer hammers the pile on the ground where the soil is hardened or gravel or stone is mixed. When the pile shoe is to prevent the damage of the pile to maintain the strength enough to penetrate the pile to the required depth, in particular, the pile shoe for PC pile, to hold the PC steel rod to apply prestress to the pile It also serves as a tension fixing jig used for pulling. The pile shoe has the function of a connector when connecting a pile to a pile, a mamilla shoe fitted to the end of the pile, a head cap fitted to the pile head, and a pile There is the same kind of anchor ring, and in Fig. 1 to Fig. 5, it is a pile shoe used in conventional PC piles. The anchoring used as a connecting member between them when connecting another PC pile to one PC pile as a pile shoe of the PC pile is shown in a perspective view and a plan view, respectively.

The pile shoe (1) is to maintain the strength of the pile, in particular, when manufacturing the PC pile is fitted with a PC steel rod used to apply prestress to the concrete, and then have a function to perform the pre-stress process to pull the PC steel rod The plate 11 is formed in an annular or cylindrical shape, and the strength reinforcing band H is formed and fixed along the circumferential edge of the plate 11 as necessary. . The plate body 11 forms a steel rod mounting portion 13 for mounting a PC steel rod, and a tension bolt coupling portion 14 for screwing the tension bolt B, and the steel rod mounting portion 13 and the tension bolt coupling portion. The communication path 15 is processed between (14), and this communication path 15 is comprised so that it may be used as an assembly path of PC steel bars. The steel rod mounting portion 13 includes a rod through hole 13A into which the rod 91A portion of the PC steel rod 91 is fitted and a head seat portion 13B on which the head 91B of the PC steel rod 91 is caught and seated. The female bolt 14N is machined into the tension bolt fastening portion 4 so as to allow screwing with the male thread portion of the tension bolt B, and the communication path 15 has sufficient rod 91A of the PC steel bar 91. It is processed to the size that can pass.

11 shows a processing process diagram for processing the pile shoe 1 of mamilache (or the head cap) as a pile shoe for PC piles in a plan view (upper view) and a cross section (lower view). The plate of mamilache (or tofu cap) is mainly used to process steel rod fitting and tension bolt fastening part by press work using iron plate of relatively small thickness (8 ~ 12t) than the plate of anchoring. Let's look at it. In order to form the steel rod mounting portion 13 in the plate body 11, the rod through hole 13A having a size through which the steel rod rod 91A can penetrate, and the PC steel rod 91 can be penetrated in tension. After the piercing processing (A-1 and T-2) of the threaded holes 14E for machining the female thread to be the bolted portion 14, respectively, the rod through hole 13A and the threaded hole are provided. Embossing (B-1 and B-2) on the 13A and 14E, so that the upper end of the rod through hole 13A is the head seat which is the part where the head 91B of the PC steel bar 91 is caught. The steel rod mounting portion 3 is formed by the portion 13B, and the threaded hole 14E has a length sufficient to process the female threaded portion. 2) A tension bolt fastening portion 14 capable of screwing the tension bolt B is formed by machining the female thread 14N, and the tension bolt fastening portion 14 thus formed is formed. ) And the steel rod mounting portion 13 is milled by a milling machine to form a communication path 15 to a size through which the rod 91A of the PC steel rod 91 can pass. )

In FIG. 12, the process drawing which processes an anchoring pile shoe as a pile shoe for PC piles is shown by the top view (upper part) and sectional drawing (lower end part). The anchoring pile shoe is mainly used to cut the plate body 13E by cutting, using a relatively thick (12 to 16t) iron plate. In order to form the steel rod mounting portion 3 in the pile shoe plate 11, the rod through hole 13A having a size that the steel rod rod 91A can penetrate, and the size of the PC steel rod 91 can penetrate, After drilling (M-1 and M-2), respectively, the threaded holes 14E for machining the female threads of the tension bolt fastening portion 14, and countersink the upper end of the rod through hole 13A. This tapered hole is formed at the upper end of the rod through hole 13A by forming a tapered, cross-sectional, plate-shaped hole, which is a site where the head 91B of the PC steel bar 91 is caught. It becomes the head seat | seat part 13B. (Bar-1, Bar-2) The female thread 14 is provided with a tensioning bolt B by tapping (thread-1 and thread-2) to the female threaded hole 14E. It becomes the tension bolt fastening portion 14 to be screwed, and milling between the tension bolt fastening portion 14 and the steel rod mounting portion 13 formed in this way can pass the rod (91A) of the PC steel bar (91). The communication path 15 is formed in the size which is. (Ah-1, ah-2)

13 to 26 illustrate a process diagram for manufacturing a pile using the pile shoe above. Reinforcing bars (90: 鐵 筋 籠) made by knitting a plurality of PC steel bars (91, reinforcing bars) by a rebar knitting machine are inserted into the lower mold 100 and pile shoes (1) at both ends of the reinforcing bars (90). Assemble When assembling the pile shoe 1 on the reinforcing rod 90, first, the PC steel bar 91 is inserted into the tension bolt fastening portion 14 (FIG. 15, 16, 17), and the PC steel bar 91 ) Is pushed toward the steel rod mounting portion 3, the rod 91B portion of the PC steel rod 91 moves along the communication path 15 of the pile shoe 1, and the head 91B portion of the PC steel rod 91 The PC steel bar 91 is settled in the steel rod mounting part 3 in the state which caught by the head seat part 32. (FIG. 18, 19, 20)

When the PC steel bar 91 is mounted to the steel rod mounting portion 3 as described above, the reinforcing rod 90 must be tensioned to apply prestress to the PC pile, and either side of the reinforcing rod 90 is placed opposite to the tension side (the As seen from the right in FIG. 21, the support plate 200 (curling plate) is brought into close contact with the tension opposite side shoe shoe 1, and the support plate 200 penetrates the tension bolt B from the side of the through hole 201 processed in the support plate 200. An extension bolt B protruding through the through-hole 201 of the 200 is screwed in accordance with the tension bolt fastening portion 14 formed in the pile shoe 1 again, and the other of the rebar long 90 One side is the tension side (left side as shown in FIG. 21). Player), the tension bolt B is penetrated from the through hole 301 side of the support plate 300, and the tension bolt B is connected to the tension bolt fastening portion 14 of the pile shoe 1 again. When the screw is fastened in accordance with (Figs. 21 and 22), as shown in the cross section shown in Fig. 24, both pile shoes 1 are firmly attached to the support plates 200 and 300 with the rebar long 90 mounted. By being combined, the PC steel bar 91 of the reinforcing rod 90, which is accommodated in the steel rod mounting portion 13 of the pile shoe 1 is to be assembled in a tensionable state, the tension-side pile shoe 1 thus assembled The tension plate 500 is coupled to the support plate 300 assembled in the back). (FIG. 25) As shown in FIGS. 21 and 22, the tensioning device 500 includes a copper plate 501, a tension shaft 502, a tension plate 503, a fastening nut 504, and a connection band ( 505, the copper plate 501 is fixed to one side of the lower mold 100, the through-hole is drilled in the center of the copper plate 501, the threaded shaft through the through hole ( 502 is assembled to be movable back and forth. Then, the tension plate 503 is fixed to one end of the tension shaft 502 assembled as described above (inside the mold around the copper plate 501), and the fastening nut 504 is attached to the other end of the tension shaft 502. Screw assembly, the support plate 300 is coupled to the tension plate 503 and the tension-side pile shoe (1) is coupled to the connection band 505.

As such, when the assembly and coupling of the reinforcing rod 90, the pile shoe 1, and the tensioning device 500 are completed in the lower mold 100, the lower mold 100 is placed on an input trolley for injecting concrete and a concrete input machine. Place the lower mold 100 on the input truck to inject concrete using the concrete injector evenly put the concrete in the lower mold 100, and then the upper mold (not shown) on the lower mold 100 The upper and lower molds are fastened with fastening bolts, and a tensioning hydraulic jack (not shown) is connected to the tension shaft 502 of the tensioning device 500, and then a predetermined tensile force is applied to the PC steel bar, that is, the steel bar 90. To seal. When the PC steel bar 91 is tensioned by the tensioning device 500, a path through which tensile force is transmitted from the tensioning side to the PC steel bar 91 is a tension axis 502 → a tension plate 503 → a connection band 505 → a support plate ( 300) → tension bolt (B) → pile shoe (1) → PC steel bar (91) is transferred to the path, the opposite side of the tension PC steel bar (91) → pile shoe (1) → tension bolt (B) → Tensile force is transmitted to the path of the support plate 200.

As described above, when the tensile force acts on the pile shoe (1), the direction of action (S and T) of the tensile force acting on the tension bolt (B) and PC steel bar (91), as can be seen in Figure 26, The tension bolt (B) and PC steel bar (91) is the opposite direction to each other so that the tension force (S and T) in the opposite direction to each other act as a shear stress against the pile shoe (1) the lower end of the tension bolt (B) Is a shear force that tries to move (rotate) in the direction of the communication path 15 (V direction), while the PC steel bar 91 tries to move (rotate) in the direction (W direction) of the communication path 15. Shear force will act. As the PC steel bar is stretched by tensioning the PC steel bar 91 with the hydraulic jack for tensioning, the tension shaft 502 is retracted (left side in FIG. 25) as much as the length thereof, and the tightening nut 504 together with the tension shaft 502 is also used. When the tightening nut 504 is separated from the curling plate 501 by a predetermined distance, the tightening nut 504 is tightened and placed in close contact with the curling plate 501 so that the tensioning force of the tensioning hydraulic jack is retracted. Even if the tension is released, the tensile strength of the PC steel rods between the two pile shoes is not destroyed and will continue to be maintained.

Maintain a constant tensile force on the PC steel bar as above, and then put the mold in the centrifugal molding machine in this state and centrifugal molding and curing with steam at 70-80 ℃. After curing of PCnAKFeNR in the curing process, the upper mold is dismantled from the lower mold, the product is demolded from the lower mold, and then the support plate 300 on the tension side of the product and the support plate 200 on the opposite side of the tension are dismantled. The product is placed in an auto clave and secondary curing with a high temperature and high pressure saturated medium. After finishing the curing, the finished product of PC pile is made. So far, we have looked at the conventional pile shoe and the process of manufacturing PC piles with this pile shoe, but the conventional pile shoe is complicated in its manufacturing process, and there are many problems in manufacturing the PC pile using the conventional pile shoe. This problem is listed as follows.

Problems caused by the manufacture of conventional PHC pile shoe

1. In processing PC steel rod mounting part and tension bolt mounting part, Mila shoe (or head reinforcement cap) is drilled through each hole by piercing process and embossed, tapping the tension bolt mounting part, and then The milling process should form a communication path, and anchoring should be done by drilling the fitting holes of the steel rod mounting part by countersinking, drilling the tapping holes of the tension bolt mounting part by tapping, and then tapping the steel rod mounting part and the tension bolt. In order to form a communication path by milling between the mounting parts, there are many processing processes and when one tab is defective when tapping the fitting holes of several tension bolt mounting parts at the same time, the processed product must be treated poorly. Productivity is extremely low, etc. 2. When tensioning PC steel bar with tensioner, As shown in FIG. 26, a tensile force is applied, and as shown in FIG. 26, a strong shearing force is generated in which the head of the PC steel rod 91 and the lower end of the tension bolt B move toward the communication path 5, respectively. (5) As the part is easily bent or torn, to prevent this, the steel plate for manufacturing the pile shoe should be made of thick ones, which increases the raw material cost, and increases the processing cost and increase the defective rate due to the processing of the thick steel plate. 3. It is necessary to go through many machining processes using a thick steel plate as described above, the machine used in each process, such as a press machine has to be large, there is a problem that the investment in equipment is large.

Note: In the conventional pile shoe plate 1, the threading hole tension bolt fitting hole 41 is a hole for processing a screw, and is not a hole for penetrating the tension bolt. Tightening bolts should be machined into small sized holes that cannot be inserted, but the tensioning bolt fitting holes of the present invention should be machined so that the tensile bolts can fully penetrate through the outer diameter of the screw.

Problems in manufacturing PHC pile using conventional PHC pile shoe

1. The PHC pile shoe itself is very heavy. Use tension bolts to When assembling the plate on the pile shoe, continue to work until the heavy bolts are assembled. Productivity decreases because the assembly work must be done by holding the plate directly. 1. When there is a defective product in tapping such as the drilling angle of the drill is not vertical and negligible during tapping on the pile shoe, the pile is inclined through the bolt hole inclined like this. Shu guripan and When assembling the plate, the bolt is inclined or the defective product cannot be inserted. 3. When tensioning the PC steel rod, the tensile force depends on the pressure stress of the mounting bolt screw and tab and is processed on the pile shoe. Since one side is open (due to the communication path processing), the bolt may come off from the mounting part. Also, because the bolt is repeatedly used, it is easy to detach the bolt from the mounting part when the bolt is worn out, so that it is easy to cause defective tensile parts. It is.

The present invention will be described with the accompanying drawings as invented to solve the above problems.

In the present invention, in forming the pile shoe, the structural part forming the rod mounting hole including the rod through hole and the head seat portion of the PC steel rod in the pile shoe plate body is similar to the conventional one, but the tension bolt fastening portion formed in the pile shoe plate body. The components are different from the conventional ones, and in the present invention, in the configuration of the mounting portion for mounting the tension bolts, the screw fasteners capable of directly fastening the tension bolts to the pile shoe plate itself are not machined. It is characterized in that only the through-hole of the coupling member such as tension bolt to form a pile shoe, and when coupling the support plate using the pile shoe formed as described above, the coupling member is prepared separately, the support plate Butt through the coupling member through hole formed in the support plate and the pile shoe plate against the shoe plate After inserting the coupling member is coupled to the fastening member (nut) prepared separately in the shank portion of the coupling member thus penetrating the pile shoe plate is characterized in a combination structure to secure the pile shoe and the support plate as a fastening. Therefore, in coupling the support plate and the pile shoe using the pile shoe according to the present invention, a coupling member including a penetrating member such as a tension bolt and a fastening member such as a nut for fastening the penetrating member is widely used. Although it is not a coupling member consisting of a tension bolt and a nut as a coupling member, it is referred to as a coupling means for coupling or disassembling the support plate and the pile shoe. For example, a key or snap ring on a rivet shank without a head on one side. The coupling means may be used as the coupling member by fitting the back.

A pile shoe according to the present invention is shown in FIG. 27 through FIG. 3 with a mamilache or head cap, and with FIG. 32 through FIG. 36 with an anchoring in a perspective and sectional view, respectively. In forming the pile shoe 6 according to the present invention, the steel rod mounting portion 67 comprising the rod through portion 67A and the head mounting portion 67B is configured to mount the PC steel 91 to the plate body 66. In addition, the plate body 66 has a size through which the penetrating member of the coupling member can penetrate to form a coupling part mounting portion 68, and a communication path between the steel rod mounting portion 67 and the coupling member mounting portion 68. (69) is processed. FIG. 37 shows a machining process diagram of the mamilache (or head cap) according to the present invention in a plan view (upper end) and a cross section (lower end). The pile shoe plate of mamilache (or tofu cap) according to the present invention is mainly processed by press working using a thin iron plate (6 to 9t) rather than the thickness of the pile shoe plate (8 to 12t) of the conventional mamilache. The method of processing the steel rod mounting portion and the coupling member mounting portion will be described according to the processing process order. Embossing of the steel rod mounting material portion 67E for forming the steel rod mounting portion 67 on the pile shoe plate 66 and the coupling member mounting material portion 68E for forming the coupling member mounting portion 68, respectively. 2) Then, the steel rod mounting material portion 17E is a steel bar 91 while the piercing processing (car-1, car-2) of the mounting material portions 67E and 68E and the communication path 69 are simultaneously performed. Steel rod mounting portion 67 formed as a rod through hole 67A, which is a portion into which the rod 91A is fitted, and a head sheet portion 67B, which is a portion where the head 91B of the steel rod 91 is caught. In the coupling member mounting material portion 68E, a coupling member mounting portion 68 having a size that can be inserted through the shank portion of the coupling member B through body is formed, and the coupling member mounting portion 68 and the steel rod mounting portion 67 are formed. The communication path 9 between) is also formed together.

38 shows a machining process diagram of the anchoring according to the present invention in a plan view (upper end) and a cross section (lower end).

The plate body of the anchoring pile shoe according to the present invention will look at the processing method by distinguishing when it is made of a thin iron plate 12t or a thick iron plate 16t. When machining the pile shoe 6 from a thin steel plate, a rod through hole 67A for fitting the rod 91A of the PC steel bar 91 to the plate body 66, and a coupling member through hole for fitting the coupling portion B. (68A) and the communication path (69) are simultaneously processed by press working (ta-1, ta-2), and then the counter seat sinks the upper end of the steel rod rod through hole (67A) to seat the PC steel bar head to be seated. By processing the 67B, the steel rod mounting portion 67, which constitutes the rod through hole 67A and the head seat portion 67B, is formed, and the engaging member through hole 68A is in communication with the communication path 69. The coupling member mounting portion 68 is formed. (Par-1, par-2)

When machining the pile shoe 6 from a thick steel plate, a rod through hole 67A for fitting the PC steel rod rod 91A to the plate body 66 and a coupling member through hole 68A for fitting the coupling member B, respectively, are provided. After drilling (ka-1, ka-2), press-processing (ta-1, ta-2) the connecting passage 69 connecting the rod through hole 67A and the coupling member through hole 68A, The steel rod mounting portion 17 which becomes the rod through hole 67A and the head seat portion 67B while processing the head seat portion 67B on which the PC steel rod head is caught and seated by performing countersinking on the upper end portion of the rod through hole 67A. Is formed, and the coupling member through-hole 68A becomes the coupling member mounting portion 68 in a state of being communicated with the communication path 69. (Par-1, par-2)

Let us look at the combination structure that combines the pile shoe formed as described above with the support plate. 39 and 40, one of the coupling members is threaded to the shank of the penetrating body, and the support plate to the pile shoe 6 according to the present invention using a bolt-type coupling member (B) using a nut as a fastener A combination structure combining (200, 300) is shown. Insert the reinforcing rod 90 into the lower mold 100, assemble the pile shoe 6 at both ends of the reinforcing rod 90, and assemble the PC steel bar 91 to the steel rod mounting portion 67 of the pile shoe 6. The assembling process is similar to the process of assembling the pile with the conventional pile shoe shown in FIGS. 13 to 20. When fastening and assembling the support plates 200 and 300 to the pile shoes 6 at both ends of the rebar long 90, the support plates 200 and 300 are brought into close contact with the pile shoes 6, and then processed to the support plates 200 and 300. Through the through-holes 201 and 301 and the through-hole 68 processed in the pile shoe 6, it penetrates through the shank part of the through-body which is the coupling member B, and is inserted so that the through-hole of the pile shoe 6 ( 68. The nut (N), which is a fastening body, is fastened to the shank end screw portion of the penetrating member projecting out of the through body, and the fastening bolt is firmly tightened with an tension wrench.

When the assembly of the support plates 200 and 300 is completed on the pile shoe 6, the tensioner 500 is mounted on one of the support plates 300, and the PC steel bar 91 is tensioned by the tensioner 500 as in the conventional method. Tension by the method of. When the PC steel bar 91 is tensioned by the tensioner 500, a path through which tensile force is transmitted from the tension axis to the PC steel bar 91 is obtained by the tension axis 502 → tension plate 503 → connection band 505 → support plate ( 300) → the penetrating member of the coupling member (B) → the fastener (nut N) of the coupling member (B) → the pile shoe (6) → the PC steel bar (91), and the opposite side of the tension side is the PC steel bar (91). The tension force is transmitted to the path of the fastener (nut N) of the coupling shoe (B) → the coupling member (B) → the penetrating member of the coupling member (B) → the support plate (200).

As can be seen from above, since the tensile force acting on the coupling member B is transmitted to the pile shoe 6 via the nut N, the tensile force of the coupling member B is the steel rod mounting portion of the pile shoe 6. 67 does not locally act on the coupling member mounting portion 68, but acts on the entire cross-sectional area of the nut N, so that it is bent toward the coupling member B or the communication path 69 to engage the coupling member B or the PC steel bar 91. ) Does not come off from pile shoe (6). Tension with the tensioner 500 and tensioning force with the tensioner fastening nut 504 to form a pile with a centrifugal molding machine while applying a constant tensile force to the PC steel bar and dismantle the coupling member (B) fastened to the support plates (300, 200) The nut (N), which has been fastened to the lower coupling member (B), is to be completed in the form of the product in the state left inside the pile shoe (6). 40 (c) and 40 (d) show a combination method different from that of the pile shoe according to the present invention, and the fastening body (nut N) fastening the coupling member B is fastened. It is intended to firmly support the PC steel bar 91 by the bearing force of the nut (N) while the side body of the nut (N) in contact with the PC steel bar (91) in one state. The advantages of the process of manufacturing the pile shoe and the PC pile shoe according to the present invention described so far and the process of improving the pile are listed in comparison with the conventional ones as follows.

Advantages of PC pile shoe manufacturing method according to the present invention

1. In the PC pile shoe according to the present invention, in forming the coupling member mounting portion, since only the through-hole of the coupling member is processed and the thread portion is not processed, the tapping processing is omitted, and the communication path is possible by press working, so that the milling machine is used. Productivity is greatly improved by eliminating the milling process by the milling process, and product defects due to the omission of tapping processing, which are difficult to process, are eliminated. Since the tensile force of B) does not act as a local stress on the pile shoe 6 but is distributed and acts in a large area, the portion of the communication path 69 of the pile shoe 6 is not bent or torn, so that Can reduce the cost of raw materials, reduce the processing cost and reduce the occurrence of defective rate, 3. Since the same thin steel plate is used and many processes are omitted or simplified, the machine is not only omitted, but the required machine can be miniaturized, thus reducing the capital investment.

Advantages of manufacturing PC pile dmf using PC pile shoe according to the present invention

1.The weight of PC pile shoe itself is easy to handle. When assembling a supporting plate such as a plate, the coupling member is once inserted into all the through holes and then fastened by a fastening member for fastening the coupling member, thereby improving productivity because the operator takes a short time to bear the weight of the supporting plate. Since there is no tap machining on the pile shoe, no assembly failure occurs due to the failure of the tab or coupling member. Since the bolts are stressed at the same time, the bolts are very unlikely to break out of the bolt holes. Since nut uses KS product as ready-made product, there is no manufacturing defect due to bad nut and also the performance of pile shoe. After manufacturing is completed, the nut remains in the pile when demolding, so it is impossible to reuse the nut, but the unit price of the nut is inexpensive. Compared to the cost burden due to such a cost, there is almost no cost burden due to the use of nuts.

Claims (3)

In forming a stake shoe having a steel rod mounting portion and a coupling member mounting portion in the plate body, the coupling member mounting portion is characterized in that the coupling shoe is formed with a through hole of a size that can penetrate the through member of the coupling member. In assembling the support plate to the pile shoe on which the PC steel rod is mounted, the support plate is brought into contact with the pile shoe, and the penetrating member penetrates the through member through the through hole of the support plate and the pile shoe. Combination structure for assembling the pile shoe and the support plate to be coupled to the fastener to enable fastening and disassembly to the through body. The combination structure according to claim 2, wherein the fastening member of the coupling member is in close contact with the PC steel bar in such a combined state to reinforce the supporting force of the PC steel bar.